In a large mixing bowl, combine the water and yeast. Let stand for 5 minutes. Stir yeast mixture to make sure yeast has dissolved. Meanwhile, in a medium bowl, combine 1 1/2 cups of the bread flour and salt. Add flour mixture and oil to the yeast mixture. Beat with an electric mixer on low speed for 1 minute. Beat on medium speed for 5 minutes more. Stir in remaining flour.